CAKPiUM.— Plate VI. 



to a slight epidermis, interstices between the lateral 

 striae hollowed down the middle ; pale yellow, faintly 

 tinged with purple towards the umbones. 

 Cardium papyraceum, par., Sowerby, Conch. HI., f. 55. 



Had. ? 



This is another very interesting shell of which no parti- 

 cular account has yet been given, Mr. Sowerby refers it to 

 Cardium papyraceum (Sp. 9.), but an important character 

 presents itself in that species, namely, the anterior side 

 being roughed with very minute granules, of which I find 

 no indication in this ; and it is moreover transversely ovate, 

 and altogether of a different tenour of form. 



Species 33. (Mus. Cuming.) 



Cardium muricatum. Card, testa cordato-ovatd, subob- 

 liqua, run 'in, a, a costatd, costisconvexis, tribus ei triginta, 

 quorum novenis a/tticis tuberculin minutis compresm, 

 oblique digestis, antice muricatis, deinde dunlins utrinque 

 muricatis, cateris postice muricatis; albidd etfiavicantc, 

 maeulh perpaucis fuscis hie illic or/tatd, lateribus mar- 

 ginibusque ventralibus aurantiis. 



The muricated Cockle. Shell cordately ovate, some- 

 what oblique, radiately ribbed, ribs convex, three and 

 thirty in number, of which nine anterior are muricated 

 with minute compressed obliquely arranged tubercles 

 on the anterior side, then follow two muricated on 

 both sides, and the rest muricated on the posterior 

 side; whitish and yellowish, ornamented here and 



there with a few light brown spots, sides and ventral 



margins orange. 

 Linn.eus, Syst. Nat., p, 1123. 

 Hub. West Indies. 



I think it very probable that several other species which 

 the more critical acumen of modern conehologists have 

 helped to identify were included under the above title by 

 early writers. 



Species 34. (Mus. Cuming.) 



Cardium echinatum. Card, testa orbiculari-cordatii, 

 subtequi/a/crali, rudialim costatd, cos/is ricenis inter- 

 num pluribus, medio exaratis, spinularum brevium serie 

 regulari sulco exorientibus, costis interstitiisque perspi- 

 cue corrugatk; albidd ant fuscesce>ite,fusco concentrite 

 fasciald. 



The short-prickly Cockle Shell orbicularly cordate, 

 nearly equilateral, radiately ribbed, ribs twenty in 

 number, sometimes more, ploughed down the middle 

 with a regular row of small short spines rising out of 

 the groove, ribs and interstices conspicuously wrinkled 

 or nither shrivelled; whitish or brownish, concentri- 

 cally banded with brown. 



L.INN2EUS, Syst. Nat,, p. 1122. Enc. meth., pi. 29S. f. 3. 



Hah. Seas of Europe. 



I cannot exactly coucur in Lamarck's description of this 



well-known species, because its chief peculiarity appears to 



me to consist in the spines being very small, short, and 



not papuliferous at the base as in the Cardium erinaceum. 



